Stock-Based Compensation Plans (Details) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options, Outstanding at beginning of period, Shares	3,202,229
Options, Outstanding at beginning of period, Weighted-Average Exercise Price, in dollars per share	$ 18.95
Options, Granted, Shares	0
Options, Granted, Weighted-Average Exercise Price, in dollars per share	$ 0.00
Options, Exercised, Shares	(906,850)
Options, Exercised, Weighted-Average Exercise Price, in dollars per share	$ 12.88
Options, Forfeited, Shares	(7,434)
Options, Forfeited, Weighted-Average Exercise Price, in dollars per share	$ 12.22
Options, Expired, Shares	(295,245)
Options, Expired, Weighted-Average Exercise Price, in dollars per share	$ 25.82
Options, Outstanding at end of period, Shares	1,992,700	3,202,229
Options, Outstanding at end of period, Weighted-Average Exercise Price, in dollars per share	$ 20.72	$ 18.95
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options, Outstanding at end of period, Aggregate Intrinsic Value	$ 7,200,000
Options, Exercisable at end of period, Aggregate Intrinsic Value	6,100,000
Options, Outstanding at end of period, Weighted-Average Remaining Contract Life (years)	4 years 2 months 16 days
Options, Exercisable at end of period, Weighted-Average Remaining Contract Life (years)	3 years 11 months 27 days
Options, Outstanding at end of period, No intrinsic value	1,214,365,000
Weighted-average grant date fair value options granted, in dollars per share	$ 0.00	$ 0.00	$ 3.05
Total fair value of options that vested	6,787,000	1,189,000	1,393,000
Total intrinsic value of options exercised	6,356,000	2,616,000	525,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Restricted Stock, at Beginning of period, Shares	418,730
Restricted Stock, at Beginning of period, Weighted-Average Grant-Date Fair Value, in dollars per share	$ 12.36
Restricted Stock, Granted, Shares	320,597
Restricted Stock, Vested, Shares	(375,402)
Restricted Stock, Vested, Weighted-Average Grant-Date Fair Value, in dollars per share	$ 13.58
Restricted Stock, Forfeited, Shares	(10,203)
Restricted Stock, Forfeited, Weighted-Average Grant-Date Fair Value, in dollars per share	$ 12.88
Restricted Stock, at end of period, Shares	353,722	418,730
Restricted Stock, at end of period, Weighted-Average Grant-Date Fair Value, in dollars per share	$ 14.03	$ 12.36
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Weighted-average grant date fair value	$ 16.75	$ 13.79	$ 9.26
Total fair value of restricted shares that vested (in thousands)	$ 5,099,000	$ 1,240,000	$ 1,365,000
Performance Shares [Member] \| Executive [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options / Restricted Stock available for future grant, Shares		42,768
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares in 2012	117,174
Share-based Compensation Arrangement by Share-based Payment Award, Options, Excluded from Shares Outstanding, Number	100,961
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares in 2013	188,129
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares in 2014	198,992
Common Stock [Member] \| Achieves a specified improvement in total shareholder return at the end of 2016 compared to 2011 and she remains an employee [Member] \| Chairman, President, and Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	135,000
Common Stock [Member] \| Achieves a specified improvement in total shareholder return at the end of 2014 compared to 2011 and she remains an employee [Member] \| Chairman, President, and Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	35,000

Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares in Year One

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Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares in Year Three

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Share Based Compensation Arrangement by Share Based Payment Award Options Vested in Period Total Fair Value

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The total fair value of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Net number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

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Number of share options (or share units) exercised during the current period.

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